CN110296810A - A kind of downburst wake flow section simulation of wind device - Google Patents
A kind of downburst wake flow section simulation of wind device Download PDFInfo
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- CN110296810A CN110296810A CN201910674932.7A CN201910674932A CN110296810A CN 110296810 A CN110296810 A CN 110296810A CN 201910674932 A CN201910674932 A CN 201910674932A CN 110296810 A CN110296810 A CN 110296810A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/08—Aerodynamic models
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- General Physics & Mathematics (AREA)
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Abstract
The invention discloses a kind of downburst wake flow section simulation of wind device, the present invention can simulate downburst wake flow section wind field, and realize the simulation of the larger geometry scaling factor wind field of downburst.A kind of downburst wake flow section simulation of wind device, including boundary layer wind tunnel, wall jet air duct, mixed flow fan, the bottom wall of the boundary layer wind tunnel is equipped with resigning mouthful, the wall jet air duct is mounted at the resigning mouthful, the wall jet air duct is C-shaped, the air inlet of wall jet air duct lower part side installs the mixed flow fan, the air outlet of wall jet air duct top side is located in boundary layer wind tunnel, the direction of air outlet is identical as the air-out direction of boundary layer wind tunnel, for simulating downburst wake flow section wind field.
Description
Technical field
The invention belongs to wind-tunnel technique field, in particular to a kind of downburst wake flow section simulation of wind device.
Background technique
Downburst is that one kind fiercely impacts ground by strong down draft in Thunderstorm Weather and formed and propagate via earth's surface
High wind destructive in short-term near the ground.Existing 80% or more collapsing for Transmission Tower related with weather is by Thunderstorm Weather
Caused by the high wind such as downburst.In order to prevent destruction of the downburst to works, need to carry out wind tunnel test, research structure object
Wind Load Characteristics of the model in downburst wind field.
Downburst simulation of wind device generates impact perpendicular to the ground using the blower being mounted at certain altitude at present
Jet stream, it is desirable that blower spout section and vertical height keep certain ratio, therefore the wind tunnel test of large scale requires biggish wind
Machine spout section and higher wind tunnel laboratory height；Practical downburst will fast move one often with translation simultaneously
It is extremely difficult for fixing with blower in the air.Downburst wind field theory and large-scale power transmission tower aeroelastic model wind
Hole experimental study seriously lags behind engineering practice.The research for acting on lower Transmission Tower-line System to downburst at present concentrates on
Center of impact, and from probability angle, since downburst center area is smaller, lead to the probability of Transmission Tower-line System destruction
Also much smaller；The area of the wake flow exit region of downburst is much bigger compared with center of impact simultaneously, for transmission line of electricity, destroys
Maximum probability be normally at the wake flow exit region of downburst, rather than center of impact, and the wake flow section of downburst
Wind profile meets typical wall jet feature.
Summary of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of downburst wake flow section simulation of wind dresses
It sets, the present invention can simulate downburst wake flow section wind field, and realize the simulation of the larger geometry scaling factor wind field of downburst.
The object of the present invention is achieved like this:
A kind of downburst wake flow section simulation of wind device, including boundary layer wind tunnel, wall jet air duct, mixed-flow wind
The bottom wall of machine, the boundary layer wind tunnel is equipped with resigning mouthful, and the wall jet air duct is mounted at the resigning mouthful, the wall surface
Jet stream air duct is C-shaped, and the air inlet of wall jet air duct lower part side installs the mixed flow fan, the wall jet
The air outlet of air duct top side is located in boundary layer wind tunnel, and the direction of air outlet is identical as the air-out direction of boundary layer wind tunnel,
For simulating downburst wake flow section wind field.
Preferably, the wall jet air duct include the steady flow segment set gradually along air-out direction, revolution contraction section and
Spout section, wherein steady flow segment, the bore of spout section are uniform, and are parallel to each other, width and the boundary layer wind tunnel width phase of spout section
It is greater than the bore of spout section Deng the bore of, steady flow segment, the bore of the revolution contraction section is gradually tapered up along air-out direction, and is bent
At c-type.
Preferably, the shrinkage curve of the revolution contraction section uses log spiral.
Preferably, the spout section in the wall jet air duct is equipped with valve and controls air force, for generating mutation air-flow
Simulate the instantaneous mutation high wind near the ground that downburst generates.
Preferably, the valve uses operated pneumatic valve, and operated pneumatic valve is driven by adjusting cylinder, the admission line of operated pneumatic valve
It is equipped with opening and closing duration of the throttle valve to control to adjust the movement velocity of cylinder, for control valve.
Preferably, the mixed flow fan adjusts wind speed by frequency converter, for simulating the downburst tail of varying strength
Flow section wind field.
Preferably, the lower end in the wall jet air duct is equipped with lifting device, for controlling the lifting of wall jet air duct, makes
The air outlet in wall jet air duct protrudes into/exits boundary layer wind tunnel, and being equipped at the resigning mouthful of the boundary layer wind tunnel bottom wall can open
The door of pass.
Preferably, the lifting device includes multiple jack, and each jack passes through bracket and wall jet air duct respectively
Connection, and it is supported in ground.
By adopting the above-described technical solution, the invention has the following beneficial effects:
1. downburst wake flow section wind field can be simulated, and wind-force, wind-force can be adjusted, and the different downbursts of simulation
Increase effect of the translational velocity to downburst wake flow high wind；
2. the instantaneous mutation high wind near the ground of downburst generation can be simulated；
3. the requirement for height of pair blower spout section and wind tunnel laboratory is lower, the larger geometry reduced scale of downburst is realized
Than the simulation of wind field.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention；
Fig. 2 is the structural schematic diagram in wall jet air duct.
Attached drawing 1 marks
In attached drawing 1,1, jack；2, mixed flow fan；3, steady flow segment；4, contraction section is turned round；5, spout section；6, pneumatic operated valve
Door；7, switchable door；8, boundary layer wind tunnel；9, changeover portion；10, flow deflector.
Specific embodiment
Referring to Fig. 1, Fig. 2, a kind of downburst wake flow section simulation of wind device, including boundary layer wind tunnel, wall jet wind
The bottom wall in road, mixed flow fan, the boundary layer wind tunnel is equipped with resigning mouthful, and the wall jet air duct is mounted on the resigning mouthful
Place, the wall jet air duct is C-shaped, and the air inlet of wall jet air duct lower part side installs the mixed flow fan,
The mixed flow fan adjusts wind speed by frequency converter, for simulating the downburst wake flow section wind field of varying strength.The wall
The air outlet of wall jet air duct top side is located in boundary layer wind tunnel, the direction and the air-out direction of boundary layer wind tunnel of air outlet
It is identical, for simulating downburst wake flow section wind field.
The lower end in the wall jet air duct is equipped with lifting device, for controlling wall jet air duct lifting (vertical direction
Stroke is not less than 100mm), so that the air outlet in wall jet air duct is protruded into/exit boundary layer wind tunnel, the boundary layer wind tunnel bottom wall
Resigning mouthful at be equipped with switchable door.It, can be by lifting device by wall surface when without simulating downburst wake flow section wind field
The air outlet in jet stream air duct exits boundary layer wind tunnel, and shuts door, does not influence the normal use of boundary layer wind tunnel.The lifting dress
It sets including 4 jack, each jack passes through channel steel bracket respectively and connect with wall jet air duct, and is supported in ground.It is true
The stability in lifting positioning and operation process is protected, need to be equipped with and be not less than 4 sets of positioning pilot pins.
The wall jet air duct includes the steady flow segment set gradually along air-out direction, turns round contraction section and spout section,
Wherein, steady flow segment, the bore of spout section are uniform, and are parallel to each other, and the width of spout section is equal with boundary layer wind tunnel width.Current stabilization
The bore of section is greater than the bore of spout section, and the bore of the revolution contraction section is gradually tapered up along air-out direction, and bends to c-type.
The shrinkage curve of the revolution contraction section uses log spiral.The spout section in the wall jet air duct is equipped with valve and controls wind
Size is measured, the instantaneous mutation high wind near the ground generated for generating mutation air-flow simulation downburst；Referring to fig. 2, the current stabilization
The air intake of section is equipped with W type air duct as changeover portion, and the bigger diameter end of changeover portion is connected to steady flow segment, the miner diameter end connection of changeover portion
The outlet air end of mixed flow fan.
The valve uses operated pneumatic valve, and operated pneumatic valve is located in the middle part of spout section, and operated pneumatic valve is driven by adjusting cylinder, gas
The admission line of movable valve is equipped with opening and closing duration of the throttle valve to control to adjust the movement velocity of cylinder, for control valve.
A kind of downburst wake flow section simulation of wind method:
The lifting of wall jet air duct is controlled by jack, when spout section bottom moves vertically to and boundary layer wind tunnel bottom
It flushes, downburst wake flow section simulation of wind may be implemented；
Wind speed is adjusted by frequency converter, simulates the horizontal high wind size that different downburst impacts ground generates；
By the switch control air force of spout section operated pneumatic valve, the close of mutation air-flow simulation downburst generation is generated
Ground instantaneous mutation high wind, when the opening of valve reduces, the air pressure in wall jet air duct is increased, and valve openings increase again
When, then generate instantaneous mutation high wind；
The direction of stream out of wall jet is consistent with boundary layer wind tunnel wind direction, while spout section sprays gas, boundary layer
Wind-tunnel runs simultaneously and generates weak uniform flow, generates to wall jet and increases effect, produces to simulate downburst translation to it
The increase effect of raw horizontal high wind near the ground.
Finally, it is stated that preferred embodiment above is only used to illustrate the technical scheme of the present invention and not to limit it, although logical
It crosses above preferred embodiment the present invention is described in detail, however, those skilled in the art should understand that, can be
Various changes are made to it in form and in details, without departing from claims of the present invention limited range.
Claims (8)
1. a kind of downburst wake flow section simulation of wind device, it is characterised in that: including boundary layer wind tunnel, wall jet air duct,
The bottom wall of mixed flow fan, the boundary layer wind tunnel is equipped with resigning mouthful, and the wall jet air duct is mounted at the resigning mouthful,
The wall jet air duct is C-shaped, and the air inlet of wall jet air duct lower part side installs the mixed flow fan, described
The air outlet of wall jet air duct top side is located in boundary layer wind tunnel, the direction of air outlet and the outlet air side of boundary layer wind tunnel
To identical, for simulating downburst wake flow section wind field.
2. a kind of downburst wake flow section simulation of wind device according to claim 1, it is characterised in that: the wall surface is penetrated
Stream air duct includes the steady flow segment set gradually along air-out direction, revolution contraction section and spout section, wherein steady flow segment, spout section
Bore it is uniform, and be parallel to each other, the width of spout section is equal with boundary layer wind tunnel width, and the bore of steady flow segment is greater than spout section
Bore, the bore of the revolution contraction section gradually tapers up along air-out direction, and bends to c-type.
3. a kind of downburst wake flow section simulation of wind device according to claim 2, it is characterised in that: the revolution is received
The shrinkage curve of contracting section uses log spiral.
4. a kind of downburst wake flow section simulation of wind device according to claim 2, it is characterised in that: the wall surface is penetrated
The spout section for flowing air duct is equipped with valve and controls air force, the wink near the ground generated for generating mutation air-flow simulation downburst
When be mutated high wind.
5. a kind of downburst wake flow section simulation of wind device according to claim 4, it is characterised in that: the valve is adopted
With operated pneumatic valve, operated pneumatic valve is driven by adjusting cylinder, and the admission line of operated pneumatic valve is equipped with throttle valve to control to adjust gas
The movement velocity of cylinder, the opening and closing duration for control valve.
6. a kind of downburst wake flow section simulation of wind device according to claim 1, it is characterised in that: the mixed-flow
Blower adjusts wind speed by frequency converter, for simulating the downburst wake flow section wind field of varying strength.
7. a kind of downburst wake flow section simulation of wind device according to claim 1, it is characterised in that: the wall surface is penetrated
Flow air duct lower end be equipped with lifting device, for control wall jet air duct lifting, make the air outlet in wall jet air duct protrude into/
Boundary layer wind tunnel is exited, is equipped with switchable door at the resigning mouthful of the boundary layer wind tunnel bottom wall.
8. a kind of downburst wake flow section simulation of wind device according to claim 7, it is characterised in that: the lifting dress
It sets including multiple jack, each jack passes through bracket respectively and connect with wall jet air duct, and is supported in ground.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910674932.7A CN110296810A (en) | 2019-07-25 | 2019-07-25 | A kind of downburst wake flow section simulation of wind device |
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| CN201910674932.7A CN110296810A (en) | 2019-07-25 | 2019-07-25 | A kind of downburst wake flow section simulation of wind device |
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Cited By (4)
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| CN112504617A (en) * | 2020-11-19 | 2021-03-16 | 重庆大学 | Method for simulating downburst flow by coupling wall surface jet flow and boundary layer wind tunnel of multi-blade wing grid |
| CN113361212A (en) * | 2021-06-02 | 2021-09-07 | 重庆科技学院 | Power transmission tower downwind direction response frequency domain analysis method under downburst storm effect |
| CN114871098A (en) * | 2022-06-20 | 2022-08-09 | 郑州一帆机械设备有限公司 | Combined type light material separator |
| CN115468731A (en) * | 2022-08-30 | 2022-12-13 | 西南交通大学 | Device for simulating non-stable wind field based on air volume adjustment |
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| CN113361212A (en) * | 2021-06-02 | 2021-09-07 | 重庆科技学院 | Power transmission tower downwind direction response frequency domain analysis method under downburst storm effect |
| CN113361212B (en) * | 2021-06-02 | 2022-05-03 | 重庆科技学院 | Power transmission tower downwind direction response frequency domain analysis method under downburst storm effect |
| CN114871098A (en) * | 2022-06-20 | 2022-08-09 | 郑州一帆机械设备有限公司 | Combined type light material separator |
| CN115468731A (en) * | 2022-08-30 | 2022-12-13 | 西南交通大学 | Device for simulating non-stable wind field based on air volume adjustment |
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Application publication date: 20191001 |